铬酸根离子在羟基铁离子-蒙脱石体系中的吸附行为研究

被引:9
作者
廖立兵
DonaldG.Fraser
机构
[1] 中国地质大学材料科学与工程学院
[2] 牛津大学地球科学系 北京
[3] 牛津大学地球科学系
[4] Parks Road
[5] Oxford OX PR
[6] UK
[7] Oxford OX
关键词
蒙脱石; 羟基铁离子; 铬酸根; 吸附;
D O I
暂无
中图分类号
P578.8 [铬酸盐];
学科分类号
摘要
采矿、电镀、制革等行业废物排放及含Cr矿物风化可造成一些地区土壤和地下水的Cr污染 .Cr主要以三价和六价形式存在 ,其中Cr(Ⅵ )有强的迁移能力 ,对动植物均有很强的毒害性 .研究了在氧化、酸性条件下 ,土壤及土壤溶液中的蒙脱石和羟基铁离子共存时对铬酸根离子 (主要以HCrO2 - 4和CrO2 - 4等Cr(Ⅵ )形式存在 )的吸附行为 .进行了蒙脱石、羟基铁离子、Cr(Ⅵ )离子添加顺序不同的 3个系列的实验 ,重点研究了Cr的初始质量浓度、溶液 pH值、环境温度、吸附时间、溶液离子强度对 3个系列Cr吸附行为的影响 ,并与羟基铁离子体系进行了对比 .结果表明 ,蒙脱石 -羟基铁离子体系的Cr吸附能力明显强于蒙脱石而低于羟基铁离子 ,其Cr吸附率随Cr初始质量浓度、温度的升高和吸附时间的延长而降低 ,随离子强度的升高而升高 ,而pH值对不同系列的Cr吸附率有不尽相同的影响 .
引用
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页码:584 / 591
页数:8
相关论文
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